Dr Jenifer Baxter, Head of Energy and Environment at IMechE and lead author of the report said: “The UK’s departure from Euratom must not be seen as an after-thought to leaving the EU. Without suitable transitional arrangements, the UK runs the risk of not being able to access the markets and skills that enable the construction of new nuclear power plants and existing power stations may also potentially be unable to access fuel.

“Making these transitional arrangements will be difficult, particularly given the short time-scale but if done correctly, could present the UK with opportunities to speed up the process of developing new nuclear power plants and reprocessing facilities, boost UK nuclear skills as well as open up the UK to more international trade deals.”

The government said leaving Euratom is the result of Brexit “as they are uniquely legally joined”.

A spokesperson added: “The UK supports Euratom and will want to see continuity of co-operation and standards. We remain absolutely committed to the highest standards of nuclear safety, safeguards and support for the industry.